Only the latest version are supported.

Please be aware that ModbusTcpServer, ModbusUdpServer, ModbusSimulatorServer as well as AsyncModbusTcpClient, ModbusTcpClient, AsyncModbusUdpClient, ModbusUdpClient are not safe to be used on non-private networks. This is pr modbus standard. Security reports telling they are not safe, are not accepted because it is a non-valid usage.

For non-private networks please use ModbusTlsServer, AsyncModbusTlsClient or ;odbusTlsClient. Using the correct certificate is an app issue and considered out of scope for pymodbus. The App can choose to e.g. use a self-signed certificates which are considered insecure.

Most vulnerabilities like e.g. a buffer overrun should just be reported as a normal issue, since it really is a bug, allowing all users to be aware of the problem.